add waypoint context to envoyfilter

[dprotaso]

Part of istio/istio#43720

/assign @howardjohn

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[howardjohn]

If we are to implement EnvoyFilter on waypoint I definitely think this is a step in the right direction. However, I don't think we yet have consensus that it is something that is desired at all. We probably would need to settle that before moving forward

[keithmattix]

I added my thoughts here: istio/istio#55149 (comment)